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COVNA Steam Pneumatic 4 20mA Control Valve
Pneumatic control valve is to use compressed gas as the power source, the cylinder as the actuator, and with the help of valve positioner, converter, solenoid valve, retaining valve, gas tank, gas filter and other accessories to drive the valve, realize the switch value or proportional adjustment, receive the control signal of industrial automation control system to complete the regulation of pipeline medium: flow, pressure, temperature, liquid level, etc Various process parameters. The characteristics of pneumatic control valve are simple control, rapid response, and intrinsic safety, no need to take additional explosion-proof measures.
- Model: pneumatic control valve
- Size Range: 3/4''~8'
- Pressure Range: PN16~PN100
- Material: WCB, 304, 316, 316L
Introduction to Pneumatic Control Valves:
The pneumatic control valve is to use compressed gas as the power source, the cylinder as the actuator, and with the help of a valve positioner, converter, solenoid valve, retaining valve, gas tank, gas filter, and other accessories to drive the valve, realize the switch value or proportional adjustment, receive the control signal of the industrial automation control system to complete the regulation of pipeline medium: flow, pressure, temperature, liquid level, etc Various process parameters. The characteristics of a pneumatic control valve are simple to control, rapid response, and intrinsic safety, no need to take additional explosion-proof measures.
The main advantages of the pneumatic control valve are that the opening and closing speed of the pneumatic control valve is easy to adjust, the structure is simple, and it is easy to maintain. Due to the buffer characteristics of the gas itself during the operation, it is not easy to be damaged due to jamming. It is more reliable than the electric valve in some explosion-proof situations
Pneumatic Control Valve Types:
Pneumatic Control Valve Technical Parameters:
| Type | Single-seat, double seat, sleeve | Nominal diameter | DN20-DN200 |
| Nominal pressure | PN16, PN25, PN40, PN63, PN100 | Connection | Flange, thread, weld (Or other customer specified) |
| Structure | Standard type (-20℃ ~+200℃ ) | Material | WCB, 304, 316, 316L |
| Cooling type | (-40~450℃ ) | Low-temperature type | (-60℃ ~-196℃ ) |
| Packing | V type PTFE, flexible graphite | Adjustable range | 50:1 |
| Sealing surface | PN16 convex surface, PN40, PN63, PN100 |
| Basic error | Less than full stroke ± 1% (With locator) Less than full |
| Accessories | locator, air filter pressure-relief valve, hand wheel device, limit switch, solenoid valve, lock up valve, and others. |
| Leakage class | Metal seal: Less than 0.01 (ANSI B16.104-1976IV) |
| Soft seal: Less than 0.00001% |
Valve components: Single-seat plunger core type; 304, 316+ SLT core seat with equal percentage, linear, quick-opening low characteristics.
Valve Actuator: Multi-spring diaphragm actuator in direct action & reverse action. NBR rubber reinforcing polyester fabric diaphragm material. Spring range 20~100KPa, 40~200KPa, 80~240KPa. Supply pressure from 0.4MPa to 0.5MPa
Action type: Air to close FO (With direct action actuator), when the air supply failure, actuator spring open the valve; Air to open FC (With reverse action actuator) When the air supply failure, actuator spring closes the valve. Linear, equal percentage, quick opening
Pneumatic Control Valve Dimensions:
